Driver drum in yarn winding machines

ABSTRACT

Rotatable driver drum in a yarn winding machine for producing conical yarn packages has a single peripheral surface portion drivingly engageable with the yarn package, the drum having a recess located at one end thereof, and at least one elongated protuberance extending from the recess and engageable with the yarn package, the elongated protuberance cooperating with the peripheral surface portion for driving the yarn package.

United States Patent [151 3,695,522 Pesch et al. [45] Oct. 3, 1972 DRIVER DRUM IN YARN WINDING MACHINES I [56] References Cited [72] Inventors: Albert 10 PGSCI'I, Monchenglad- FOREIGN PATENTS OR APPLICATI N bach; Wilhelm Maassen, Monchen- O s gladbach-Hardt, both of Germany 949,283 2/1949 France ..242/43.2 [73] Assignee: Walter Reiners, Monchengladbach, Primary Examiner stanley N Gflreath Germany Attorney-Curt M. Avery [22] Filed: Sept. 15, 1970 [57] ABSTRACT [2]] Appl. No.: 72,517 Y Rotatable driver drum in a yarn unndlng machine for Related US. Applic ti n Data producing conical yarn packages has a single [63] Continuation f 747'421, July 11, peripheral surface portion drivingly engageable with 1968, abandoned, which is a continuation-inthe Y Package, the drum having a recess located at part f 75 4 July 23 19 5 abanone end thereof, and at least one elongated protubedonmi rance extending from the recess and engageable with the yarn package, the elongated protuberance [30] Foreign Application Priority Data Cooperating with the peripheral surface portion for July 1 1, 1968 Germany ..R 38492 dmmg yam package" 3 Claims, 3 Drawing Figures [52] US. Cl. ..242/18 DD, 242/432 I [51] Int. Cl ..B65h 54/42, B65h 54/48 [58] Field of Search ..242/43.2, 18 DD DRIVER DRUM IN YARN WINDING MACHINES This application is a continuation of our application Ser. No. 747,421, filed July 1 l, 1968, now abandoned, which is a continuation-in-part of our application Ser. No. 475,442, filed July 28, 1965, now abandoned.

The invention relates to driver drums in yarn winding machines producing yarn packages, such as conical cross-wound take-up spools.

With such driver drums, the take-up spools are placed in rotation and entrained by the drum due to frictional forces generated between the engaging surfaces of the drum and spool.

It is known to employ a reciprocating yarn guide or traverse for shifting the position of the yarn on the coil. It is furthermore known to employ a driver drum proper for shifting the yarn by providing the drum with yarn guiding grooves. Our invention accordingly relates more particularly to such so-called yarn guiding drums.

In the production of conical take-up spools with the aid of a guiding drum which drives the spool at its periphery, it has not been possible until now to form a neat coil or winding at the ends of the conventionally conical take-up spool. Particularly at that end of the spool having the smaller diameter, the untidy or irregular coil formation becomes noticeable as a waveshaped end surface, a so-called flower formation which causes disturbances afterwards when the spool is being unwound. Numerous experiments, in all events to obtain a neat coil formation at the ends of conical takeup coils, have not heretofore proven successful.

It is accordingly an object of our invention to provide a driver drum in yarn winding machines which will avoid the aforementioned difficulties of the known driver drums and more particularly to provide such a driver drum in the form of a guiding drum that will ensure trouble-free coil formation at the ends of conical take-up spools, especially at that end thereof which has the smaller diameter.

With the foregoing and other objects in view, we provide in accordance with our invention a driver drum having a recessed surface portion located at least at one end thereof and having elongated protuberances extending solely from this recessed surface portion. The invention is thus based upon recently acquired knowledge that defective coil formation at the ends of conical take-up spools can be avoided if success is achieved in removing or greatly reducing the friction between the guide drum and the take-up spool that is generated in the take-up spool in the vicinity of the ends thereof during the winding-up operation and the felting or milling operation incident thereto. This friction arises when, during the winding operation, the extensions of the axes of the spool and the guiding drum as well as the extension of the line of engagement between the spool and the guiding drum do not intersect at one point.

Experiments to shape the guiding drum surface in the vicinity of the spool ends so that it is especially smooth and, if desired, to provide the same with gliding means, have, it is true, resulted in an improvement, however it can only be considered to be satisfactory for specific types of yarn. A further improvement toward solving the foregoing problem was provided when the guiding drum was shaped so that the take-up spool did not abut against the guiding drum in the vicinity of its ends. However if particularly soft or loosely wound take-up spools are to be fonned with a guiding drum of this last mentioned improved structure, the diameter of the take-up spool at the locations that are not in contact with the guiding drum gradually becomes so great that the spool comes into contact with the guiding drum also at those end locations not originally in contact with the guiding drum.

By recessing the peripheral surface of the drum at least at one end portion thereof and providing elongated linear protuberances solely at the recessed surface portion, the friction between guiding drum and take-up spool is reduced to a minimum at the end locations thereof without any gradual increase of the takeup spool diameter at the recessed surface portion when winding soft take-up spools.

In accordance with a further aspect of our invention the elongated protuberances or beads are offset from one another on the recessed surface. It is particularly advantageous moreover if the elongated protuberances extend around the peripheral surface of the recessed drum portion. In many cases it is particularly advantageous for producing conical take-up spools, if the recessed surface and elongated protuberances thereon are located solely at the end of the drum lying adjacent the small-diameter end of the conical take-up spool. Consequently, a greater contact surface between the guiding drum and the take-up spool and, consequently, a smaller surface pressure is attained at the large diameter end of the take-up spool at which there is less danger of the formation of a poorly wound coil end.

This smaller surface pressure in turn has the advantage that a softer or looser spool winding is possible.

When the driver drum is provided with yarn guiding grooves, in accordance with a further aspect of the invention, the edges of the yarn guiding grooves can serve as the elongated protuberances. Thus, the construction of the guiding drum precludes the necessity for providing special elongated protuberances or ridges on the device. For producing conical take-up spools, this construction has the advantage that the yarn being wound is guided directly at the spool surface.

Other features which are considered as characteristic for the invention are set forth in the appended claims.

Although the invention is illustrated and described herein as embodied in driver drum in yarn winding machines, it is nevertheless not intended to be limited to the details shown, since various modifications and structural changes may be made therein without departing from the spirit of the invention and within the scope and range of equivalents of the claims.

The construction and method of operation of the invention, however, together with additional objects and advantages thereof will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings, in which:

FIGS. 1 to 3 are front elevational views of three different embodiments of the driver drum constructed in accordance with our invention.

Referring now to the drawings and first particularly to FIG. 1 thereof, there is shown agyarn guiding drum 1 which, when rotated, produces rotation, in turn, of a yarn package shown here as a lfrustoconical cross wound take-up spool 2 abutting against it, due to frictional forces produced along the engaging peripheries thereof. Yarn guiding grooves 3 are provided in the drum 1 for depositing the yarn to be wound on the spool 2 in a known manner. It is apparent that at the end portion of the yarn guiding drum 1 lying adjacent to the small-diameter end of the conical cross-wound spool 2, the peripheral surface of the yarn guiding drum 1 between the yarn guiding grooves 3 is recessed at the location 4 so that the cross-wound spool 2 only abuts fully against the surface of the yarn guiding drum 1 at the location 5 whereas, from the shoulder 5a up to the left-hand end of the drum as shown in FIG. 1, only the edges 3a of the yarn guiding grooves which provide an elongated linear protuberance or ridge are in contact with the surface of the cross-wound spool 2.

In FIG. 1 there is shown a preferred embodiment that is suitable for the most varied conicality of the take-up spool and for the most varied types of yarns and-hardness or tightness of winding without requiring any particularly increased cost of producing the yarn guiding drum.

In the embodiment of FIG. 2, the driver drum 1 is not constructed as a yarn guiding drum but instead a reciprocating yarn guide or traverse 9, shown schematically, is provided adjacent to the driver drum. It is obvious also that, in the embodiment of FIG. 2, the driver drum 1 is recessed so that it has a portion of reduced diameter adjacent the small-diameter end of the crosswound spool 2, and is also provided with longitudinal linear protuberances or ridges 7. In the embodiment shown specifically in FIG. 2, the linear protuberances 7, however, do not extend around the entire recessed periphery of -the drum but rather only in short arcs over a portion of the periphery, respectively, and are also staggered one from another.

In the third embodiment of FIG. 3 there is again shown a yarn guiding drum 1 provided with a yarn guiding groove 3, the drum acting as driver for the take-up or cross-wound spool 2. In contrast to the embodiment of FIG. 1, the edges of the yarn guiding grooves 3 in FIG. 3 are not, however, provided with longitudinal protuberances or ridges but rather, similar to the embodiment of FIG. 2, separate linear protuberances or ridges 8 within the recessed portion of the yarn guiding drum 1 are provided. The protuberances 8, however, contrary to the short spaced protuberances 7 of the embodiment shown in FIG. 2, extend around the entire recessed drum periphery. Furthermore the embodiment of FIG. 3 differs from that of FIG. 1 in that the end portion of the drum surface which lies adjacent to the large-diameter end of the cross-wound spool 2 is also provided with a recess (4a) produced by a slightly conical profiling of the respective end of the drum. Naturally, this structural feature can possibly also be utilized with particular advantage in the embodiments of FIGS. 1 and 2 whenever the characteristics of the yarn or the degree of conicality of the cross-wound spool should make it necessary.

It has been noted hereinabove that the embodiment of FIG. 1 has a particular advantage in that for minimal cost of manufacture or production, a generally salutary result is achieved. This result can be achieved, moreover, both with cylindrical as well as with conical driver drums, so that our invention can be employed therefore for th tyges of drum.

The embo imen shown in the drawing are described herein only as representing certain specific preferred embodiments of the invention. It is possible, however, to interchange individual structural features of the embodiments of FIGS. 1 to 3 such as adding, for example, the recess 40 of the embodiment shown in FIG. 3 to the embodiments shown in FIGS. 1 and 2. In a similar manner, the linear protuberances or ridgesvin FIGS. 1 to 3 can be substituted one for the other. As previously pointed out hereinabove, the same effect and end results as for the embodiment of FIG. 1 can thereby also be achieved, however in each case an increase in the cost of constructing the drive drum has to be taken into consideration.

I claim:

1. In a yarn winding machine for producing conical yarn packages, a rotatable driver drum having a single first peripheral surface portion of cylindrical shape drivingly engageable with the yarn package, said drum having a second peripheral surface portion of smaller diameter than said first surface portion located at one end thereof, at least one elongated protuberance extending from said second surface portion and engagea-' ble with the yarn package, said elongated protuberance cooperating with said first peripheral surface portion for driving the yarn package, and including reciprocable traverse means located adjacent said driver drum for reciprocatingly displacing oncoming yarn along the yarn package.

2. In a yarn winding machine for producing conical yarn packages, a rotatable driver drum having a single first peripheral surface portion of cylindrical shape drivingly engageable with the yarn package, said drum having second peripheral surface portions of smaller diameter than said first surface portion, and at least one elongated protuberance extending from one of said second surface portions and engageable with the yarn package, said elongated protuberance cooperating with said first peripheral surface portion for driving the yarn package, said second peripheral surface portions being respectively located at both ends of said drum on either side of said first peripheral surface portion.

3. Driver drumaccording to claim 2, wherein said second peripheral surface portions respectively taper down from said first peripheral surface portion.

' F-QQOS M:

STATES Pei-EM OFFICE 5 J t I Petent No. 3,695,522 Dated O tober 3, 1972 Invantorflg) Albert Th0 Pesch 61, al.

J V J! J-C' 4- m ene aooveucentuled patent It is certified that actor appears and that said Letters Patent are hereby corrected as shown below:

In the heading to the printed specification, Lihe 16,

"July 11, 1968 I Germany. 338492" shouldread 30, v o 0 n I a n I o Signed and sealed this 12th day of March 19.74.

(SEAL) Attest:

EDWARD M.FLETCHE'R,JR. C. MARSHALL DANN v Attesting Officer Commissioner of Patents 

1. In a yarn winding machine for producing conical yarn packages, a rotatable driver drum having a single first peripheral surface portion of cylindrical shape drivingly engageable with the yarn package, said drUm having a second peripheral surface portion of smaller diameter than said first surface portion located at one end thereof, at least one elongated protuberance extending from said second surface portion and engageable with the yarn package, said elongated protuberance cooperating with said first peripheral surface portion for driving the yarn package, and including reciprocable traverse means located adjacent said driver drum for reciprocatingly displacing oncoming yarn along the yarn package.
 2. In a yarn winding machine for producing conical yarn packages, a rotatable driver drum having a single first peripheral surface portion of cylindrical shape drivingly engageable with the yarn package, said drum having second peripheral surface portions of smaller diameter than said first surface portion, and at least one elongated protuberance extending from one of said second surface portions and engageable with the yarn package, said elongated protuberance cooperating with said first peripheral surface portion for driving the yarn package, said second peripheral surface portions being respectively located at both ends of said drum on either side of said first peripheral surface portion.
 3. Driver drum according to claim 2, wherein said second peripheral surface portions respectively taper down from said first peripheral surface portion. 